The Beastie Boys’ Adam Horovitz once had a weird roommate experience that involved 40 air fresheners. “We used to rent out rooms my whole childhood, so I had weirdos coming in and out of my life,” he told us at a party for IFC Films’ “Frances Ha” at MoMA, explaining how he and a friend moved in a woman with a carful of books. “It took all [bleeping] day . . . Say it was, like, a Tuesday. Then Thursday morning, gone. The woman was gone, all the books, everything. And for the next week in every room, everywhere in the apartment, I kept finding those stick-up air fresheners. She put up about 40 of them and vanished.” Greta Gerwig, who stars in the movie about a lost 20-something who feels abandoned by her roommate (and who co-wrote the script with boyfriend, Noah Baumbach), confessed she can be problematic. “I don’t know that I’m a good roommate,” she said. “I’m messy.” Also there were Sting and Trudie Styler, who came to support daughter Mickey Sumner, who’s in the film, and Ben Stiller.